题目

He paid the boy 10 yuan foe washing ten windows, most of ____ hadn’t been cleaned for at least a year. A. theseB. those   C. thatD. which   答案：D非限制性的定语从句，which 做of的宾语。若函数，且f（f（2））＞7，则实数m的取值范围为（    ）。